Dr. Sheya vs Atramedes 10 Heroic
And thats my solo kill of Heroic Atramedes as warlock. Here are some infos and my tactics about this fight if you want to try it yourself:
I used Soul Leech, Mortal Coil, Dark Bargain, Kil'jaeden's Cunning as talents and of course Grimoire of Supremacy for the Voidlord. Glyphs were Soul Swap, Siphon Life and Soul Shard.
The fight has two phases: the ground and the air phase.
You will only have seven shields to counter Searing Flames and Tracking, which means that Atramedes has to die before the fourth air phase begins (around minute eight).
Very important as warlock is, that you don't have two slow stacks from Kil'jaeden's Cunning before he casts Sonic Breath - you will get hit from the breath with two stacks. Also use the Demonic Gateway and your Demonic Circle during the air phase to kite Tracking as long as possible. And never forget to heal your pet with Soul Swap:Health Funnel!
Good luck!